Ottawa Construction Association

Founded in 1889, the Ottawa Construction Association is one of the largest regional construction associations in Canada with more than 1,100 firms active in all sectors of the region's $5-billion construction market. The OCA serves its members in four major ways –Construction Project Information, Education, Networking and Advocacy.

OCA Summer Hours

Please note OCA is currently on Summer Hours. From June 1st to September 1st, the office is open from Monday - Thursday from 8:00 AM to 4:30 PM, and Friday from 8:00 AM - 3:00 PM


Need to schedule Commissioner of Oath services?

This is a free service for OCA Members. Contact one of the commissioners by email during business hours (8:30am - 4:00pm)
Currently on duty Please call ahead for in person service.
Non-members would need to purchase Virtual Witnessing at $17.70 + HST for each document witnessed.


Looking for a location to host your next meeting?

Meeting room rentals are for sessions which do not involve an admission or training fee. If you would like to rent a room to conduct training or any type of event for which a fee will be charged, please contact the Ottawa Construction Association directly at: and provide us with the details of the event.


Publish your Certificates with OCA!

Construction purchasers, owners’ representatives and prime contractors can publish Ontario legal notices on including; Certificates of Substantial Performance, Notices of Non-Payment of Holdback, Notices of Termination, Certificates of Completion of Subcontract, Notices of Intention to Register a Condominium Link2Build charges a flat fee of just $199 per notice.

OCA Membership

Membership in OCA is your investment to growing your business! Explore our website to learn more about accessing thousands of bid opportunities, marketing your firm’s services or products, growing your business network, professional development opportunities in OCA’s Education program or the numerous cost saving OCA Affinity programs.

See all upcoming courses
  • Upcoming courses

    03 October 2023
    From $649.00 excl. Tax

    CCDC 14+15 – Managing the Uniqueness of Design Build

    This course is part of the Managing Construction Series


    03 October 2023
    From $315.00 excl. Tax

    Online Bluebeam Training: Revu Basics

    This two-day instructor-led series will provide you with the knowledge and skills to create, edit, markup, and collaborate on AEC documents using Bluebeam Revu.